When quantum computers eventually reach larger scales,
they’ll probably remain pretty precious resources, locked away in
research institutions just like our classical supercomputers. So anyone
who wants to perform quantum calculations will likely have to do it in
the cloud, remotely accessing a quantum server somewhere else. A new double-blind cryptography method
would ensure that these calculations remain secret. It uses the
uncertain, unusual nature of quantum mechanics as a double advantage.

Imagine you’re a developer and you have some code you’d like to run
on a quantum computer. And imagine there’s a quantum computer maker who
says you can run your code. But you can’t trust each other — you, the
developer, don’t want the computer maker to rip off your great code, and
the computer builder doesn’t want you to peep its breakthrough machine.
This new system can satisfy both of you.

Stefanie Barz and colleagues at the University of Vienna’s Center for
Quantum Science and Technology prepared an experimental demonstration
of a blind computing technique, and tested it with two well-known
quantum computing algorithms.